# Relationship history for MSHA mine 4201352

Current hierarchy: **Lammert James → Lammert Mining Company → Jimbo Bob**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Lammert James → Jimbo Bob; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Murphy Mining Company → Jimbo Bob; 1950-01-01 to 1978-12-26; source msha-controller-operator-history
- **controller_controls_mine:** Murphy Nicholas L Jr → Jimbo Bob; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Murphy Nicholas L Jr → Murphy Mining Company; 1950-01-01 to 1978-12-26; source msha-controller-operator-history
- **operator_operates_mine:** Lammert Mining Company → Jimbo Bob; 1978-12-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lammert James → Lammert Mining Company; 1978-12-27 to current/open; source msha-controller-operator-history